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To ensure that we have more accurate line information for a block

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don't elide the branch instruction if it's the only one in the block,
otherwise it's ok.

PR9796 and rdar://11215207

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154417 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2012-04-10 18:18:10 +00:00
parent b79855ee18
commit 18112d83e7
2 changed files with 7 additions and 3 deletions
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7
lib/CodeGen/SelectionDAG/FastISel.cpp
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@@ -821,8 +821,11 @@ FastISel::SelectInstruction(const Instruction *I) {
/// the CFG.
void
FastISel::FastEmitBranch(MachineBasicBlock *MSucc, DebugLoc DL) {
if (FuncInfo.MBB->isLayoutSuccessor(MSucc)) {
// The unconditional fall-through case, which needs no instructions.
if (FuncInfo.MBB->getBasicBlock()->size() > 1 && FuncInfo.MBB->isLayoutSuccessor(MSucc)) {
// For more accurate line information if this is the only instruction
// in the block then emit it, otherwise we have the unconditional
// fall-through case, which needs no instructions.
} else {
// The unconditional branch case.
TII.InsertBranch(*FuncInfo.MBB, MSucc, NULL,